Armed with rocks, bricks, pistols and wooden sticks, protesters angry over the burning of Korans at the largest American base in Afghanistan this week took to the streets in demonstrations in a half-dozen provinces on Wednesday that left at least seven dead and many more injured.

The fury does not appear likely to abate soon. Members of Parliament called on Afghans to take up arms against the American military, and Western officials said they feared that conservative mullahs might incite more violence at the weekly Friday Prayer, when a large number of people worship at mosques.

“Americans are invaders, and jihad against Americans is an obligation,” said Abdul Sattar Khawasi, a member of Parliament from the Ghorband district in Parwan Province, where at least four demonstrators were killed in confrontations with the police on Wednesday.

Standing with about 20 other members of Parliament, Mr. Khawasi called on mullahs and religious leaders “to urge the people from the pulpit to wage jihad against Americans.”

President Hamid Karzai is scheduled to address both houses of Parliament on Thursday morning.